| A R O C Builders INC | Robert Edward Espinoza | — | (818) 201 5737 | GC, remodel, ADU | Granada Hills · Los Angeles County | — | — |
| A R O C Drywall INC | Alex Raul Olmedo | — | (818) 486 9674 | Other | Pacoima · Los Angeles County | — | — |
| A R P Contractor Corp | Ana Connie Ramos | — | (323) 499 6280 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| A R P Electrical Services | Alexander Rodriguez Perez | — | (818) 298 6812 | Electricians | Granada Hills · Los Angeles County | — | — |
| A R P I Mechanical INC | Gary Alan Farajian | — | (818) 700 2777 | HVAC | Chatsworth · Los Angeles County | — | — |
| A R Painting INC | Rodriguez Alfredo | — | (818) 262 9978 | Windows, patio, painters | Panorama · Los Angeles County | — | — |
| A R Plumbing Services | Allen Reyes Harry | — | (323) 290 2811 | Other | Los Angeles · Los Angeles County | — | — |
| A R Ramos INC DBA Architectural Glazing Systems | Abel Ramos | — | (323) 221 1756 | Windows, patio, painters | Huntington Park · Los Angeles County | — | — |
| A R T E Construction & Development INC | Hector Macario Gonzalez | — | (310) 261 9144 | GC, remodel, ADU | Alhambra · Los Angeles County | — | — |
| A R V Construction | Arevalo Luis | — | (818) 324 9935 | GC, remodel, ADU | Winnetka · Los Angeles County | — | — |
| A R V General Construction | Otto Rene Vasquez | — | (818) 642 3991 | GC, remodel, ADU | Reseda · Los Angeles County | — | — |
| A R V S INC | Albert Barseghian | — | (818) 968 0734 | HVAC | Glendale · Los Angeles County | — | — |
| A R Wilson Electric | Andrew Robert Wilson | — | (310) 570 5613 | Electricians | Santa Monica · Los Angeles County | — | — |
| A R Y Construction & Marketing INC | Yardeny Avraham | — | (310) 613 2569 | GC, remodel, ADU | Woodland Hills · Los Angeles County | — | — |
| A Reynoso Construction Company | Alfonso Jr Reynoso | — | (909) 625 6906 | GC, remodel, ADU | Claremont · Los Angeles County | — | — |
| A S A F Garage Doors Repair INC | Steren Asaf | — | (818) 602 3126 | GC, remodel, ADU | Woodland Hills · Los Angeles County | — | — |
| A S A P Construction Services | Edward John Luboff | — | (818) 388 1441 | GC, remodel, ADU | Tujunga · Los Angeles County | — | — |
| A S A P Rooter | A S A P Rooter | — | (323) 855 9707 | Other | Los Angeles · Los Angeles County | — | — |
| A S A P Structual Steel | Montano Jaime | — | (626) 449 6141 | Other | Pasadena · Los Angeles County | — | — |
| A S A Plumbing INC | Andreh Mehrabians | — | (818) 848 4848 | GC, remodel, ADU | Burbank · Los Angeles County | — | — |
| A S Builders Group INC | Sasi Amit | — | (818) 601 8705 | GC, remodel, ADU | Castaic · Los Angeles County | — | — |
| A S C Construction Company | Shaun Michael Corey | — | (424) 603 9059 | GC, remodel, ADU | Torrance · Los Angeles County | — | — |
| A S C Landscaping | A S C Landscaping | — | (562) 336 9611 | Windows, patio, painters | Long Beach · Los Angeles County | — | — |
| A S C Process Systems INC | Gudrun Brigitte Mason | — | (818) 833 0088 | Other | Valencia · Los Angeles County | — | — |
| A S D | A S D | — | (818) 526 0121 | GC, remodel, ADU | Burbank · Los Angeles County | — | — |
| A S Design & Construction | Juan Carlos Aguilar Santos | — | (818) 979 4471 | GC, remodel, ADU | Pacoima · Los Angeles County | — | — |
| A S E Electric INC | Estanislao Ruiz-Tovar | — | (562) 355 1961 | Electricians | Long Beach · Los Angeles County | — | — |
| A S G Scaffold | A S G Scaffold | — | (818) 903 7783 | Other | Pacoima · Los Angeles County | — | — |
| A S G Scaffolding INC | Arturo Solis Godines | — | (818) 903 7783 | Other | Sylmar · Los Angeles County | — | — |
| A S I Builders INC | Alan James Svilik | — | (818) 839 5695 | GC, remodel, ADU | Sherman Oaks · Los Angeles County | — | — |
| A S I Electric INC | Nathalie Rachel Naor | — | (818) 285 8513 | Electricians | Northridge · Los Angeles County | — | — |
| A S I Networks INC | Jeff David Plumley | — | (909) 869 6160 | Other | San Dimas · Los Angeles County | — | — |
| A S K Construction | Sayadyan Karo | — | (818) 268 9000 | GC, remodel, ADU | Burbank · Los Angeles County | — | — |
| A S Plastering | A S Plastering | — | (323) 899 0947 | Other | Huntington Park · Los Angeles County | — | — |
| A S Plumbing | A S Plumbing | — | (818) 266 4471 | Other | Tarzana · Los Angeles County | — | — |
| A Sabillon Construction | Hernandez Adolfo | — | (323) 533 3012 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| A Sandoval Tree Service INC | Alfredo Junior Sandoval | — | (818) 455 3368 | Tree | Arleta · Los Angeles County | — | — |
| A Satellite Source | A Satellite Source | — | (626) 780 9331 | Other | Rosemead · Los Angeles County | — | — |
| A Satin Touch | A Satin Touch | — | (818) 703 1266 | Windows, patio, painters | Canoga Park · Los Angeles County | — | — |
| A Skyline Communications | A Skyline Communications | — | (310) 413 0735 | Other | Culver City · Los Angeles County | — | — |